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74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
Rev. 5 — 26 May 2016
Product data sheet
1. General description
The 74HC7540; 74HCT7540 is an 8-bit inverting buffer/line driver with Schmitt-trigger
inputs and 3-state outputs. The device features two output enables (OE1 and OE2). A
HIGH on OEn causes the outputs to assume a high-impedance OFF-state. Inputs include
clamp diodes. This enables the use of current limiting resistors to interface inputs to
voltages in excess of V
CC
. Schmitt trigger inputs transform slowly changing input signals
into sharply defined jitter-free output signals.
2. Features and benefits
Input levels:
For 74HC7540: CMOS level
For 74HCT7540: TTL level
Inverting outputs
Low-power dissipation
Complies with JEDEC standard no. 7 A
Multiple package options
ESD protection:
HBM JESD22-A114F exceeds 2000 V
MM JESD22-A115-A exceeds 200 V
Specified from
40 C
to +85
C
and from
40 C
to +125
C
3. Ordering information
Table 1.
Ordering information
Package
Temperature range
74HC7540D
74HCT7540D
74HC7540DB
40 C
to +125
C
SSOP20
40 C
to +125
C
Name
SO20
Description
plastic small outline package; 20 leads;
body width 7.5 mm
plastic shrink small outline package; 20 leads;
body width 5.3 mm
Version
SOT163-1
SOT339-1
Type number
NXP Semiconductors
74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
4. Functional diagram
Fig 1.
Logic symbol
Fig 2.
IEC logic symbol
5. Pinning information
5.1 Pinning
Fig 3.
Pin configuration SO20
Fig 4.
Pin configuration SSOP20
74HC_HCT7540
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
Rev. 5 — 26 May 2016
2 of 15
NXP Semiconductors
74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
5.2 Pin description
Table 2.
Symbol
OE1
A0 to A7
GND
Y0 to Y7
OE2
V
CC
Pin description
Pin
1
2, 3, 4, 5, 6, 7, 8, 9
10
18, 17, 16, 15, 14, 13, 12, 11
19
20
Description
output enable input (active LOW)
data input
ground (0 V)
data output
output enable input (active LOW)
supply voltage
6. Functional description
Table 3.
Control
OE1
L
L
X
H
[1]
Functional table
[1]
Input
OE2
L
L
H
X
An
L
H
X
X
Output
Yn
H
L
Z
Z
H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
7. Limiting values
Table 4.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
V
CC
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
P
tot
[1]
[2]
Parameter
supply voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
Conditions
V
I
<
0.5
V or V
I
> V
CC
+ 0.5 V
V
O
<
0.5
V or V
O
> V
CC
+ 0.5 V
0.5
V < V
O
< V
CC
+ 0.5 V
[1]
[1]
Min
0.5
-
-
-
-
70
65
Max
+7
20
20
35
70
-
+150
500
Unit
V
mA
mA
mA
mA
mA
C
mW
SO20, SSOP20
[2]
-
The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
For SO20 package: above 70
C
the value of P
tot
derates linearly with 8 mW/K.
For SSOP20 package: above 60
C
the value of P
tot
derates linearly with 5.5 mW/K.
74HC_HCT7540
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
Rev. 5 — 26 May 2016
3 of 15
NXP Semiconductors
74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
8. Recommended operating conditions
Table 5.
Recommended operating conditions
Voltages are referenced to GND (ground = 0 V)
Symbol Parameter
V
CC
V
I
V
O
T
amb
supply voltage
input voltage
output voltage
ambient temperature
Conditions
Min
2.0
0
0
40
74HC7540
Typ
5.0
-
-
+25
Max
6.0
V
CC
V
CC
+125
Min
4.5
0
0
40
74HCT7540
Typ
5.0
-
-
+25
Max
5.5
V
CC
V
CC
+125
V
V
V
C
Unit
9. Static characteristics
Table 6.
Static characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
T
amb
= 25
C
Min
74HC7540
V
OH
HIGH-level
output voltage
V
I
= V
T+
or V
T
I
O
=
20 A;
V
CC
= 2.0 V
I
O
=
20 A;
V
CC
= 4.5 V
I
O
=
20 A;
V
CC
= 6.0 V
I
O
=
6.0
mA; V
CC
= 4.5 V
I
O
=
7.8
mA; V
CC
= 6.0 V
V
OL
LOW-level
output voltage
V
I
= V
T+
or V
T
I
O
= 20
A;
V
CC
= 2.0 V
I
O
= 20
A;
V
CC
= 4.5 V
I
O
= 20
A;
V
CC
= 6.0 V
I
O
= 6.0 mA; V
CC
= 4.5 V
I
O
= 7.8 mA; V
CC
= 6.0 V
I
I
I
OZ
I
CC
C
I
input leakage
current
OFF-state
output current
supply current
input
capacitance
HIGH-level
output voltage
V
I
= V
T+
or V
T
; V
CC
= 4.5 V
I
O
=
20 A
I
O
=
6.0
mA
4.4
3.98
4.5
4.32
-
-
4.4
3.84
-
-
4.4
3.7
-
-
V
V
V
I
= V
CC
or GND; V
CC
= 6.0 V
V
I
= V
T+
or V
T
; V
CC
= 6.0 V;
V
O
= V
CC
or GND
V
I
= V
CC
or GND; I
O
= 0 A;
V
CC
= 6.0 V
-
-
-
-
-
-
-
-
-
0
0
0
0.15
0.16
-
-
-
3.5
0.1
0.1
0.1
0.26
0.26
0.1
0.5
8.0
-
-
-
-
-
-
-
-
-
-
0.1
0.1
0.1
0.33
0.33
1.0
5.0
80
-
-
-
-
-
-
-
-
-
-
0.1
0.1
0.1
0.4
0.4
1.0
10
160
-
V
V
V
V
V
A
A
A
pF
1.9
4.4
5.9
3.98
5.48
2.0
4.5
6.0
4.32
5.81
-
-
-
-
-
1.9
4.4
5.9
3.84
5.34
-
-
-
-
-
1.9
4.4
5.9
3.7
5.2
-
-
-
-
-
V
V
V
V
V
Typ
Max
T
amb
=
40 C
to +85
C
Min
Max
T
amb
=
40 C
to +125
C
Min
Max
Unit
74HCT7540
V
OH
74HC_HCT7540
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet
Rev. 5 — 26 May 2016
4 of 15
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